Besides, a cautious stance adopted by participants ahead of the monthly expiry in the derivatives segment tomorrow following closure of markets on Thursday for "Christmas", cast its shadow on sentiments.
After rising over 150 points in early trade on the back of a firming trend in global markets coupled with covering-up of short positions by speculators, the Sensex fell back to close at 27,506.46, down 195.33 points, or 0.71 per cent. It shuttled between 27,851.10 and 27,475.13.
Similarly, the National Stock Exchange index Nifty, after rising to 8,364.75 at the outset, succumbed to selling pressure and dipped below the 8,300-mark to end at 8,267.00, down 57 points, or 0.68 per cent after moving between 8,364.75 and 8,252.85.
Major losers that pulled down the Sensex and Nifty were metals, realty, consumer durables, oil & gas, IT, PSU, power, healthcare, banking and auto sector stocks.
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Out of 30-Sensex constituents, 20 ended lower and 10 finished in positive zone.
Further, poll trends in Jharkhand and Jammu & Kashmir also influenced sentiments, they said.
Bucking the trend, NTPC, Bajaj Auto, Cipla, Bharti Airtel, Hero MotoCorp, GAIL, ITC Ltd and TCS ended between 0.08 and 3.03 per cent higher and limited the fall in the benchmark.
Sectorwise, the BSE metal index suffered the most by falling 1.89 per cent, followed by Capital Goods (1.46 pc), Consumer Durables (1.39 pc), Oil & Gas (0.96 pc), IT index (0.90 pc), Realty index (0.77 pc), Banking index (0.69 pc), Auto index (0.18 pc) and Healthcare index (0.06 pc), all in the negative territory.
Meanwhile, foreign portfolio investors (FPIs) sold shares worth a net Rs 335.24 crore yesterday, as per provisional data from stock exchanges.